You can put this solution on YOUR website! A car traveling at 10 m/s accelerates at 1.5 m/s^2 for 20 s. How far does it go? What speed is obtained?
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1.5 m/sec/sec for 20 seconds adds 30 m/sec to its speed (1.5*20).
The speed increases to 40 m/sec
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The average speed is (10 + 40)/2 = 25 m/sec
25 * 20 = 500 meters